HP E4418B Programming Manual page 160

FETCh[1|2][:SCALar][:POWer:AC]? [<expected_value>[,<resolution>[,<source list>]]]
1. The mnemonic
parameter used in the command sub-systems. The parameters must be entered in
the specified order. If parameters are omitted, they will default from the right.
The parameter DEFault is used as a place holder. Specifying
parameter value unchanged.
2. When the measurement result is linear this parameter represents the number
of significant digits. When the measurement result is logarithmic 1 to 4
represents a resolution of 1, 0.1, 0.01 and 0.001 respectively.
Example
Error Messages
If the last measurement is not valid error -230, "Data corrupt or stale"
occurs. A measurement is valid after it has been initiated. It becomes
invalid when either a reset occurs or any measurement parameter, for
example frequency, is changed.
If the expected value and resolution parameters are not the same as the
current expected value and resolution setting on the specified window,
error -221, "Settings conflict" occurs.
HP E4418B/E4419B Programming Guide
Item Description/Default
source list This is the channel on which the
command is implemented. If
unspecified the current window
setup is used. However, on the
HP E4419B, if the window shows a
ratio or difference measurement,
the upper window defaults to
channel A and the lower window to
channel B.
DEF means DEFault. This is not equivalent to the DEFault
FETC2:POW:AC?
MEASurement Instructions
Range of Values
(@1)
(@2) (HP E4419B
only)
DEF
This command queries the lower
window's measurement result.
leaves the
2-23